Effect of inert and reactive gases on stability of high-speed hydrogen micro jet flame

Результат исследования: Публикации в книгах, отчётах, сборниках, трудах конференцийстатья в сборнике материалов конференциинаучнаярецензирование

Аннотация

Experimental data are presented on the effect of inert (He, N2, Ar, CO2) and reactive (SH4, O2, CF3Br, (CH3O)3PO) gas additives to hydrogen flow and ambient air on flame separation during diffusion combustion of a hydrogen microjet emanating from a round micronozzle into air. The micronozzle is a stainless steel tube with an inner diameter of 0.5 mm, a length of 30 mm, and a wall thickness of 0.1 mm. The shadow method is used to determine the critical hydrogen velocity at which the flame of the hydrogen microjet separates from the nozzle upon injection of additives into air and into the hydrogen flow. It is found that the addition of the above gases to hydrogen narrows the microjet velocity range in which stabilization of the flame can be achieved with injection of both inert and reactive additives. For the hydrogen flow with the additives studied, the critical velocity of flame separation from the micronozzle depends primarily on the mean molecular weight of the gas mixture. In the case of the addition of the gases to the air surrounding the diffusion flame, the critical velocity of flame separation is determined by their effect on the chemical reactions of hydrogen oxidation (inhibiting effect) and by the reduction of oxygen concentration due to air dilution with the additive. The results could be of interest to experts in hydrogen energetics for determining the conditions of stable hydrogen microjet combustion and the minimum concentrations of flame-suppressing additives to air preventing the ignition and combustion of hydrogen after its accidental release.

Язык оригиналаанглийский
Название основной публикацииInternational Conference on Physics and Chemistry of Combustion and Processes in Extreme Environments, ComPhysChem 20-21 and VI International Summer School "Modern Quantum Chemistry Methods in Applications"
РедакторыValeriy N. Azyazov, Alexander M. Mebel
ИздательAmerican Institute of Physics Inc.
ISBN (электронное издание)9780735440401
DOI
СостояниеОпубликовано - 8 дек 2020
Событие2nd International Conference on Physics and Chemistry of Combustion and Processes in Extreme Environments, ComPhysChem 20-21 and 6th International Summer School on Modern Quantum Chemistry Methods in Applications - Samara, Российская Федерация
Продолжительность: 26 июл 202130 июл 2021

Серия публикаций

НазваниеAIP Conference Proceedings
Том2304
ISSN (печатное издание)0094-243X
ISSN (электронное издание)1551-7616

Конференция

Конференция2nd International Conference on Physics and Chemistry of Combustion and Processes in Extreme Environments, ComPhysChem 20-21 and 6th International Summer School on Modern Quantum Chemistry Methods in Applications
СтранаРоссийская Федерация
ГородSamara
Период26.07.202130.07.2021

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